Rocket Stove for indirect heating (newbie question)

Hello everyone, I have been looking at rocket stoves and old wood stoves for the alternate use of heating water. I had the concept of using a wood stove first and using the heat riser for a copper coil to produce water for both bath and using the heat to produce drinkable water from rain water. As I looked into the many things people have done, I drifted to a rocket stove bench because of the heat being stored for a long period of time.

I was planning on having a new stick built house made (a small cabin type) and installing under floor heating (hydronic underfloor heating systems) and I was wondering if it is feasible to draw water thru a rocket stove mass and have that heat the loop?

The second issue was with a wood floor and small area, I was thinking of instead of having the rocket stove in the main house, to have it in a shed with a cement floor. The Shed would serve as a bathhouse and the place for the rocket stove.

The Bath would be a Galvanized Stock Tank. I always wanted a hot soaking bath and if heating a large quantity of water is a bi-product of home heat.

So the question is
1. Am I overthinking this and the use of a rocket stove should be the primary heat and built into the design of the house rather then bothering with underfloor heating?(skip the shed and put the money on the main build)
2. I know a rocket stove can be used to heat water, so it should not be unreasonable to have a pipe flowing through for water for heating bath water and a second line for drinking water.

This is a build for a single person and maybe a few visitors from time to time.

Thanks for your feedback.

1. Am I overthinking this and the use of a rocket stove should be the primary heat and built into the design of the house rather then bothering with underfloor heating?(skip the shed and put the money on the main build)

A rocket needs to be where you're spending your time, you won't do 4 hours a day in your shed.

Heating water for your bath, that's a good idea, which can be done. With extreme caution. Heating water to drink, i'm dubious. Because you need the water to boil for 20 minutes, to be perfectly drinkable. I think UV treatement is far more efficient. Or boiling directly in a pan.